Is there a name for the trope of something topical but not strictly necessary happening incidental to a punchline like the microwave in the last panel?

I know I’ve seen it in other places, but the only other instance I can think of is the people saying “I am a consumer whore!” “And how!” in the Rejected cartoon, and I’m not even sure that qualifies.

Maybe a few things that happen in the asdfmovies too, but they often introduce a recurring gag or a different joke entirely.